Article
Engineering, Environmental
Elaheh Hojaji, Matjaz Valant, Anna-Karin Axelsson
Summary: A newly developed hydrogen generation model incorporating both adsorption and irradiation mechanisms for a 10-LED photoreactor is presented and validated against experimental data. The model is based on Langmuir-Hinshelwood kinetics and Radiative Transport Equation, successfully predicting photocatalytic hydrogen production with minor computational effort.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Moussa Abbas
Summary: Despite advancements in water purification technologies, challenges remain in degrading certain stubborn molecules like pesticides, dyes, and industrial or agricultural residues. This study focused on the photolysis degradation of the textile dye BPB under UV irradiation without a catalyst, exploring various factors such as pH, photonic intensity, BPB concentration, and irradiation time. Results showed that COD changes and solution mineralization occurred slowly, with 4 hours of irradiation needed for 20% COD reduction. The study also found that the apparent rate constants for BPB degradation increased linearly with light flux, and the Langmuir-Hinshelwood model provided a better correlation for degradation kinetics.
DESALINATION AND WATER TREATMENT
(2021)
Article
Engineering, Environmental
Alyssa Azaroff, Mathilde Monperrus, Carole Miossec, Claire Gassie, Remy Guyoneaud
Summary: This study investigated the degradation potential of synthetic musks, UV filters, and a pharmaceutical compound in marine sediment samples under laboratory conditions. The results showed different half-life times for the contaminants under biotic conditions, with limitations observed in degradation under anoxic conditions compared to oxic conditions. Novel aerobic bacteria capable of degrading these contaminants were successfully isolated, potentially aiding in remediation processes in marine environments.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Environmental Sciences
Yasmin Vieira, Eder C. Lima, Edson Luiz Foletto, Guilherme Luiz Dotto
Summary: This review focuses on the imminent threat of microplastics (MPs) associated with pharmaceuticals on the aquatic environment and public health, emphasizing their ubiquity and the interactions with environmental factors. Mathematical tools are utilized to enhance information interpretation, and the importance of MPs' sorption and interaction behavior towards organic contaminants is highlighted in understanding their dynamics in the environment. Lastly, the toxicity and bioaccumulation of MPs and pharmaceuticals are discussed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Biotechnology & Applied Microbiology
R. Sivaranjanee, P. Senthil Kumar
Summary: This review examines the adverse effects of emerging contaminants on the environment and human health, summarizes various research attempts to enhance remediation methods or establish new treatment modalities. It also introduces analytical techniques used to identify and separate emerging contaminants.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Miguel Angel Mueses, Jose Colina-Marquez, Fiderman Machuca-Martinez, Gianluca Li Puma
Summary: This article critically reviews the mathematical modeling of heterogeneous photocatalytic solar reactors for the degradation of emerging contaminants in water, identifying key factors for further development such as the incorporation of contaminants and water matrix in radiation and reaction kinetics models, the influence of hydrodynamics on the radiation field of the photoreactor, and the transient reactor models considering temperature and solar irradiation fluctuations.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Geosciences, Multidisciplinary
Shyrill Mae F. Mariano, Luisa F. Angeles, Diana S. Aga, Cesar L. Villanoy, Caroline Marie B. Jaraula
Summary: This study examines the distribution, sources, and seasonal variability of pharmaceuticals in key aquatic systems in the Philippines. The results show that pharmaceuticals primarily come from hospital wastewater and various water sources, with higher concentrations observed during the dry season. Therefore, stricter wastewater management measures, particularly in communities near water bodies and tourist areas, are necessary to mitigate the potential impact on the environment.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Chemistry, Physical
Fernando J. Beltran, Javier Rivas, Juan-Fernando Garcia-Araya
Summary: This study addressed the challenge of establishing the rate of photon absorption in external photoreactors by adapting SFM equations developed for central lamp photoreactors. The results showed slight differences from those obtained using the Monte Carlo method. Additionally, intrinsic rate constants and scavenging factors for the photocatalytic oxidation of contaminant compounds were determined based on the validated photon absorption rate.
Article
Chemistry, Physical
M. E. Borges, H. de Paz Carmona, M. Gutierrez, P. Esparza
Summary: Photocatalysis is a promising method for wastewater treatment to remove emerging pollutants. The effectiveness of unsupported and supported TiO2 photocatalysts was tested in the degradation of ciprofloxacin, a model molecule of emerging wastewater component, under different light sources. The results confirmed the high degradation rates of ciprofloxacin using TiO2 photocatalyst under visible and UV radiation, and the good photoactivity of TiO2 coated in glass support material under solar radiation. This study validates the viability of photocatalytic reactor system for eliminating emerging contaminants through environmentally sustainable treatments.
Article
Environmental Sciences
Pinakshi Biswas, Bhanu Prakash Vellanki
Summary: The study quantified 16 target compounds in the River Yamuna, with caffeine, estrone, gemfibrozil being among the most commonly found. Higher concentrations were detected post-monsoon. Runoff from catchment areas is a contributing factor to the increased concentration of compounds.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Clovis Nchikou, Jose Angel Loredo-Medrano, Aracely Hernandez-Ramirez, Jose Angel Colina-Marquez, Miguel Angel Mueses
Summary: In this study, a new Six Flux Model in two dimensions (SFM-2D) was introduced to estimate the local volumetric rate of photon absorption in polar coordinates, and it was applied and validated on a photocatalytic reactor. An analytical solution of the radiant transfer equation was obtained based on the novel SFM-2D, which also included the estimation of the radiant field in a compound parabolic photoreactor. The numerical results from simulations showed satisfactory comparisons with previous works, with discrepancies less than 0.5% for the overall performance of the new model.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Omar Celis-Hernandez, Andrew B. Cundy, Ian W. Croudace, Raymond D. Ward, Rosa Busquets, John L. Wilkinson
Summary: The environmental concentrations of seven ECs were studied in dated intertidal saltmarsh cores from two estuarine sites in the southern U.K., revealing the mobility of these contaminants in the marsh systems and their lack of clear association with input trends or sediment geochemistry changes.
Review
Environmental Sciences
Khalid Muzamil Gani, Nhlanhla Hlongwa, Taher Abunama, Sheena Kumari, Faizal Bux
Summary: The study focuses on the prevalence and removal of emerging contaminants in South Africa, conducting a risk assessment and zone wise classification approach, revealing data deficiencies in certain areas. Unmanaged urine diverted toilets are identified as a potential source of EC pollution to groundwater in South Africa. It suggests the need for a specific EC monitoring program tailored to the country based on occurrence levels and sources.
Review
Environmental Sciences
Hai Duc Minh Tran, Sandrine Boivin, Hitoshi Kodamatani, Keisuke Ikehata, Takahiro Fujioka
Summary: The study compared the effectiveness of UV lamps with different wavelengths in eliminating pathogens and CECs in water, finding that the combined use of 222 nm KrCl or 185 + 254 nm LP-Hg lamps with H2O2 is the best option for achieving target removal levels of both pathogens and CECs in potable water reuse.
Article
Chemistry, Multidisciplinary
Linda Ansone-Bertina, Karina Upska, Linda Dobkevica, Jorens Kviesis, Raimonds Meija, Maris Klavins
Summary: Environmental pollution with contaminants of emerging concern is a significant issue globally. Immobilized humic substances can serve as cost-effective sorbents for removing pollutants in water, with iron-compound-immobilized humic substances being particularly effective for arsenic removal.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Alexandre Diorio, Jennyfer Diaz-Angulo, Reynel M. Castellanos, Ana I. Gomes, Rosangela Bergamasco, Marcelo Fernandes Vieira, Marcia Dezotti, Miguel Angel Mueses, Fiderman Machuca-Martinez, Vitor J. P. Vilar
Summary: This study aimed to integrate multiple hydrogen peroxide activation mechanisms for reactive oxygen species generation towards the removal of contaminants of emerging concern in a continuous-flow unit. The combination of UVC/H2O2/TiO2 system with radial addition of H2O2 and multiple TiO2-P25 layers achieved high efficiency in removing the antibiotic amoxicillin. Urban wastewater matrix negatively affected the removal of amoxicillin due to the presence of ROS scavengers and light-filtering species.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Biotechnology & Applied Microbiology
Eliana M. Jimenez-Bambague, Juan S. Florez-Castillo, Rosa D. Gomez-Angulo, Paola A. Morales-Acosta, Enrique J. Pena-Salamanca, Fiderman Machuca-Martinez, Carlos A. Madera-Parra
Summary: Pharmaceutical compounds like ibuprofen and diclofenac have been found in water sources in Latin America, and microalgal-based systems have shown promise in removing these micropollutants. In this study, Parachlorella kessleri demonstrated good removal efficiency for ibuprofen and diclofenac through mechanisms like bioaccumulation and biodegradation.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Environmental Sciences
Nestor A. Urbina-Suarez, Darly D. Ayala-Gonzalez, Jennyfer D. Rivera-Amaya, Andres F. Barajas-Solano, Fiderman Machuca-Martinez
Summary: The study evaluated the effect of tannery wastewater on biomass and product production of three microorganisms. The results indicate that the use of a constant light regime and the concentration of real wastewater have a significant impact on biomass production.
Article
Electrochemistry
Bryan Acosta-Angulo, Jennyfer Diaz-Angulo, Jose Lara-Ramos, Ricardo Torres-Palma, Diana Martinez-Pachon, Alejandro Moncayo-Lasso, Fiderman Machuca-Martinez
Summary: This article explores the spread of genetic algorithms (GA) and particle swarm optimization (PSO) in the study of reaction kinetics using bibliometric analysis of the Scopus database. The study focuses on applications in advanced oxidation processes (AOPs), examining collaborations between countries and authors, and keyword co-occurrences. The findings reveal that GA methods are the preferred choice for reaction kinetic studies, with the USA being the most influential country in terms of collaboration. However, there is still a lack of collaboration among most countries, including authors. Furthermore, literature on AOPs remains scarce. The forecasting suggests that there will be further growth in the implementation of evolutionary algorithms, particularly PSO.
Review
Multidisciplinary Sciences
Rodrigo A. Munoz Meneses, Gerardo Cabrera-Papamija, Fiderman Machuca-Martinez, Luis A. Rodriguez, Jesus E. Diosa, Edgar Mosquera-Vargas
Summary: Pollution caused by plastic materials poses a negative impact on the health of the planet. Finding solutions to transform discarded plastics into new materials is crucial for establishing a circular and sustainable production model.
Article
Electrochemistry
Eliana M. Jimenez-Bambague, Carlos A. Madera-Parra, Maria F. Rangel-Delgado, Isabel Quintero-Martinez, Daniela Miranda-Mosquera, Juan S. Aristizabal-Apolinar, Fiderman Machuca-Martinez
Summary: The objective of this study was to evaluate the performance of Photo-Fenton (PF) and Electro-Fenton (EF) processes for the removal of pharmaceutical compounds in wastewater. The operational conditions and removal efficiencies were assessed for both processes. EF showed a higher removal efficiency for all identified compounds, making it the best option for treating this real effluent.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Chemical
Jose David Venecia-Nunez, Leidy Tatiana Ramirez-Parra, Jose Antonio Lara-Ramos, Fiderman Machuca-Martinez, Jose Angel Colina-Marquez, Miguel Angel Mueses
Summary: Caffeine, as a commonly found contaminant in the environment, has significant effects on aquatic species and human health. The study used a photocatalysis-based technique, O-3/UV/GHT, to degrade and mineralize caffeine in solution. By optimizing factors such as O-3 dose, GHT charge, agitation speed, pH, initial caffeine concentration, and UV light, the process achieved a degradation rate of approximately 99.97% in less than 20 minutes, with a mineralization rate of 38.02%.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Jose Munoz-Chilito, Jose A. Lara-Ramos, Lorena Marin, Fiderman Machuca-Martinez, Juan P. Correa-Aguirre, Miguel A. Hidalgo-Salazar, Serafin Garcia-Navarro, Luis Roca-Blay, Luis A. Rodriguez, Edgar Mosquera-Vargas, Jesus E. Diosa
Summary: The impacts of adding multi-walled carbon nanotubes (MWCNTs) on the properties of thermoplastic polyurethane (TPU) plates were investigated in terms of morphology, electrical conductivity, and hardness. TPU/MWCNT nanocomposite plates were fabricated using compression molding, with MWCNT loadings ranging from 1% to 7%. X-ray diffraction analysis indicated that the incorporation of MWCNTs increased the ordered range of the TPU polymer matrix. SEM images showed that the fabrication route used resulted in a uniform dispersion of nanotubes inside the TPU matrix, creating a conductive network for electronic conduction. Impedance spectroscopy revealed that the TPU/MWCNT plates exhibited percolation and tunneling conduction mechanisms, with increasing conductivity values as the MWCNT loading increased. Additionally, the addition of MWCNTs increased the Shore A hardness behavior of the TPU plates, despite a reduction in hardness compared to pure TPU.
Article
Environmental Sciences
Nestor A. Urbina-Suarez, Christian Rivera-Caicedo, Angel Dario Gonzalez-Delgado, Andres F. Barajas-Solano, Fiderman Machuca-Martinez
Summary: The research focuses on the use of advanced oxidation process (AOPs) with hydrogen peroxide (H2O2) and sodium bicarbonate (NaHCO3) for the treatment of tannery wastewater. The optimal process conditions for removing different compounds were found to be NaHCO3 1 M, H2O2 2 M, and 60 degrees C, with high removal efficiencies for color and ammoniacal nitrogen. This study concludes that AOPs using H2O2 and NaHCO3 are recommended for effective removal of color and ammoniacal nitrogen in tannery wastewater.
Article
Engineering, Multidisciplinary
Santiago Sinisterra, Ruben Camargo-Amado, Diego Trivino, Fiderman Machuca-Martinez
Summary: This article introduces a research methodology based on patent analysis and the behavior of technology over time. Two software were used to extract and analyze patent data, and the results of the technological maturity cycle and future projections of the technology were obtained. A case study on antibacterial and self-cleaning surfaces technology was conducted, and it was found that the technology is in the maturity phase. This methodology is important for decision-making in research and development.
REVISTA FACULTAD DE INGENIERIA, UNIVERSIDAD PEDAGOGICA Y TECNOLOGICA DE COLOMBIA
(2023)
Article
Environmental Sciences
Eliana M. Jimenez-Bambague, Carlos A. Madera-Parra, Fiderman Machuca-Martinez
Summary: The COVID-19 pandemic has had a significant impact on global health and the environment. The excessive use of pharmaceuticals during the pandemic has led to an increase in micropollutants entering the environment. Monitoring data in Cali, Colombia, shows a 91% increase in the concentration of analgesics and anti-inflammatory drugs in wastewater after the pandemic, which is associated with the consumption of these drugs for mild symptoms. This increase poses a high ecological threat, being 14 times higher than pre-COVID-19 levels.
CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH
(2023)
Article
Engineering, Chemical
Nestor A. Urbina-Suarez, German L. Lopez-Barrera, Janet B. Garcia-Martinez, Andres F. Barajas-Solano, Fiderman Machuca-Martinez, Antonio Zuorro
Summary: The UV/H2O2 system in real tannery wastewater was evaluated using experimental design and optimal reaction surface analysis. pH and temperature were found to have the largest impact on the process. Acidic pH of 4.5-5.5 and temperatures between 50 and 70(degrees)C were found to improve COD and ammonium oxidation. The study confirmed the process conditions and evaluated the removal rates of nitrite, ammonium, chromium, chlorides, BOD, COD, and color.
Article
Engineering, Chemical
Nestor A. Urbina-Suarez, Cristian J. Salcedo-Pabon, Jefferson E. Contreras-Ropero, German L. Lopez-Barrera, Janet B. Garcia-Martinez, Andres F. Barajas-Solano, Fiderman Machuca-Martinez
Summary: This study investigates the influence of photoperiod and wastewater concentration on the growth of microalgae and cyanobacteria for the removal of environmentally significant parameters from dyeing wastewater. The findings indicate that extended photoperiods and higher wastewater concentrations enhance biomass production. Hapalosiphon and Chlorella sp. demonstrate better tolerance to wastewater toxicity and improved removal of COD and BOD.
Article
Engineering, Chemical
Nestor A. Urbina-Suarez, Cristian J. Salcedo-Pabon, German L. Lopez-Barrera, Janet B. Garcia-Martinez, Andres F. Barajas-Solano, Fiderman Machuca-Martinez
Summary: A bicarbonate-peroxide (BAP) system was used to improve the quality of industrial tannery wastewater. The I-optimal experimental design was used to optimize critical variables, including temperature, initial pH, bicarbonate, and H2O2 concentration. The experiments were conducted in 500 mL reactors with an operational volume of 250 mL and agitation at 550 rpm. The optimized conditions were validated using statistical analysis, and it was found that temperatures above 50 degrees C and slightly acidic initial pHs were crucial for the efficiency of the BAP system. The validated optimal data showed high removal percentages for various pollutants, surpassing other advanced oxidation processes (AOPs) used for similar types of water.
Article
Engineering, Multidisciplinary
Jennyfer Diaz-Angulo, Alfonso Barboza-Meza, Fiderman Machuca-Martinez, Miguel-Angel Mueses
Summary: Mathematical analysis and simulation of a discontinuous rectification column were conducted during the start-up process using an operational strategy. The research focused on establishing a mathematical model based on the equilibrium state and utilized MESH equations for solution. The results were validated by experimental data, demonstrating the effectiveness of the proposed solution.
REVISTA FACULTAD DE INGENIERIA, UNIVERSIDAD PEDAGOGICA Y TECNOLOGICA DE COLOMBIA
(2022)